I have looked at Terrain3D a few times in the past in this channel, and it's the most mature and comprehensive solution for creating and editing Terrain in the Godot game engine, a feature that is not included out of the box. Well the Terrain 3D add-on just hit a major milestone, the 1.0 release!
Key Links
https://gamefromscratch.com/terrain3d-for-godot-hits-1-0-release/
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